Proximity induced magnetic anisotropy and trefoil fermiology in monolayer FeCl₂/Bi(111)
Author(s)
Type
Journal Article
Abstract
Interfaces between magnetic and non-magnetic materials play a crucial role in various magnetic heterostructures. The emergence of 2D van der Waals (vdW) magnets has introduced new opportunities for exploring proximity effects in vdW heterostructures. While the influence of magnetic layers on nearby non-magnetic materials has been widely studied, it remains unclear whether non-magnetic substrates can similarly modulate the intrinsic magnetic properties of 2D magnets, particularly their magnetic anisotropy. In this work, by analyzing X-ray magnetic circular dichroism spectra of an epitaxially grown FeCl2 monolayer on a Bi(111) surface, a reorientation of magnetic anisotropy is observed – from its natural out-of-plane to a predominantly in-plane alignment. This effect vanishes in bilayer FeCl2/Bi(111), where the magnetic anisotropy reverts to its intrinsic out-of-plane orientation, consistent with the layered antiferromagnetic order of bulk FeCl2. Angle-resolved photoelectron spectroscopy reveals the presence of metallic interface states derived from the Bi surface states, accompanied by charge transfer and emergence of a moiré potential that gives rise to a distinctive trefoil-shaped Fermi surface. These results demonstrate that non-magnetic substrates can exert strong proximity influence on the magnetic and electronic behavior of 2D vdW magnets, offering new strategies for engineering magnetic anisotropy and electronic structure in spintronic heterostructures.
Date Issued
2026-03-17
Date Acceptance
2026-02-05
Citation
Advanced Materials, 2026, 38 (16)
ISSN
0935-9648
Publisher
Wiley
Journal / Book Title
Advanced Materials
Volume
38
Issue
16
Copyright Statement
© 2026 The Author(s). Advanced Materials published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Publication Status
Published
Article Number
e21534
Date Publish Online
2026-02-19